Photosynthesis and dry-matter partioning are main procedures in crop growth and development models. In this paper, a model is presented based on experiment of sweet potato variety Xushu 18.

光合作用和于物质的生产与分配模型是作物生长模拟模型中最基础的部分，在试验的基础上以徐薯18为例建立模型。

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Based on simulated model of JiangNan Double Crop rice, growth and development status of early rice effected only by climate condition in ChangDe Area from1961to2000were simulated respectively.

以江南双季稻生长评估模型为工具，模拟了常德地区1961 - 2000年早稻的生长状况。

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Build a good crop growth and development model, not only can predict the crop in different environmental conditions, most need to re-estimate the model parameters and optimization.

构建良好的作物生长发育模型，不但可以预测作物在不同的环境条件下模型参数大多需要重新估计和优化。

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